Pretty sure it was a dump. Buying the shares to replace the numbers sold will move the SP up more than they dropped, as seen last time someone bought similar numbers.
I suspect a number of holders have in recent times sold out to cash up to buy lithium stocks. In hindsight I wish I had done so, when I first thought Pilbara Minerals looked interesting! As usual, it was the fear of waking up a few days later to see a trading halt and announcement on the JV selling the cobalt resource to BHP or Elon Musk and missing out on 10 bags (although more likely it will be Creasy & GAL and 1 bag or less).
Whatever is going to happen, I think it will happen in the next 4 months before they need more money for the gold exploration.
BAR Price at posting:
1.8¢ Sentiment: Hold Disclosure: Held